@rundocuri- I have been to the Bay Beach Wildlife Sanctuary several times, and I found the wildlife to be very beautiful. There are a lot of waterfowl to observe, but the best time of year for you and your friends to travel there depends on what you are hoping to see.
In the spring months, you can witness the waterfowl and their young, which is always heartwarming to watch. In late summer and early fall, the waterfowl have their full feathers, and are very beautiful. Plus, the leaves are beginning to turn into their fall colors, and the scenery at the sanctuary is peaceful and pretty during this time of year.